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Damage triggered by bioerosion and surface residence time in Holocene shell beds from Brazil.

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Title: Damage triggered by bioerosion and surface residence time in Holocene shell beds from Brazil.
Authors: Sedorko, Daniel1,2 (AUTHOR) sedorko@mn.ufrj.br, Barros, João Paulo Porto3 (AUTHOR), Nebelsick, James H.2 (AUTHOR), de Barros, Gabriel Eduardo Barea4,5 (AUTHOR), Xavier, Juan Bueno1 (AUTHOR), Bó, Patrick Führ Dal'3 (AUTHOR), Castro, João Wagner Alencar1 (AUTHOR)
Source: Facies. May2025, Vol. 71 Issue 2, p1-16. 16p.
Subject Terms: *Taphonomy, *Sedimentology, *Biogenic sedimentary rocks, *Energy dissipation, *Mollusks, *Fouling, *Holocene Epoch
Geographic Terms: Brazil, Rio de Janeiro (Brazil)
Abstract: Holocene shell beds along the Brazilian coast provide critical records of sea level variations influenced by climatic changes. This study examines the taphonomic implications of bioerosional traces in bioclastic accumulations from coastal sites in Rio de Janeiro State, Brazil. By integrating sedimentological, taphonomic, and taxonomic data, the relationship between bioerosion and shell damage signatures was explored, focusing on three Quaternary localities rich in mollusk shell remains. Detailed analyses using thin sections, X-ray microtomography, and compaction tests identified four distinct bioerosion incipient- traces: Entobia, Caulostrepsis, Meandropolydora, and Oichnus. The results show that the one active depositional site has a higher proportion of bioclasts with bioerosion but fewer shells with taphonomic damage compared to two Holocene sites. The higher fragmentation rates at Holocene sites are linked to longer exposure times of bioeroded shells before final burial. These differences suggest that shorter exposure times lead to lower fragmentation rates despite higher bioerosion levels. Mechanical tests confirmed that bioeroded shells are more fragile, breaking into angular fragments, thereby contributing significantly to shell damage. Thus, bioerosion coupled with moderate surface residence times, plays a crucial role in shell fragmentation, with hydrodynamic conditions being a secondary agent of shell damage in high-energy environments. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
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Header DbId: enr
DbLabel: Energy & Power Source
An: 184007933
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Damage triggered by bioerosion and surface residence time in Holocene shell beds from Brazil.
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  Data: <searchLink fieldCode="AR" term="%22Sedorko%2C+Daniel%22">Sedorko, Daniel</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> sedorko@mn.ufrj.br</i><br /><searchLink fieldCode="AR" term="%22Barros%2C+João+Paulo+Porto%22">Barros, João Paulo Porto</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Nebelsick%2C+James+H%2E%22">Nebelsick, James H.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22de+Barros%2C+Gabriel+Eduardo+Barea%22">de Barros, Gabriel Eduardo Barea</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Xavier%2C+Juan+Bueno%22">Xavier, Juan Bueno</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bó%2C+Patrick+Führ+Dal'%22">Bó, Patrick Führ Dal'</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Castro%2C+João+Wagner+Alencar%22">Castro, João Wagner Alencar</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Facies%22">Facies</searchLink>. May2025, Vol. 71 Issue 2, p1-16. 16p.
– Name: Subject
  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Taphonomy%22">Taphonomy</searchLink><br />*<searchLink fieldCode="DE" term="%22Sedimentology%22">Sedimentology</searchLink><br />*<searchLink fieldCode="DE" term="%22Biogenic+sedimentary+rocks%22">Biogenic sedimentary rocks</searchLink><br />*<searchLink fieldCode="DE" term="%22Energy+dissipation%22">Energy dissipation</searchLink><br />*<searchLink fieldCode="DE" term="%22Mollusks%22">Mollusks</searchLink><br />*<searchLink fieldCode="DE" term="%22Fouling%22">Fouling</searchLink><br />*<searchLink fieldCode="DE" term="%22Holocene+Epoch%22">Holocene Epoch</searchLink>
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  Label: Geographic Terms
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  Data: <searchLink fieldCode="DE" term="%22Brazil%22">Brazil</searchLink><br /><searchLink fieldCode="DE" term="%22Rio+de+Janeiro+%28Brazil%29%22">Rio de Janeiro (Brazil)</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Holocene shell beds along the Brazilian coast provide critical records of sea level variations influenced by climatic changes. This study examines the taphonomic implications of bioerosional traces in bioclastic accumulations from coastal sites in Rio de Janeiro State, Brazil. By integrating sedimentological, taphonomic, and taxonomic data, the relationship between bioerosion and shell damage signatures was explored, focusing on three Quaternary localities rich in mollusk shell remains. Detailed analyses using thin sections, X-ray microtomography, and compaction tests identified four distinct bioerosion incipient- traces: Entobia, Caulostrepsis, Meandropolydora, and Oichnus. The results show that the one active depositional site has a higher proportion of bioclasts with bioerosion but fewer shells with taphonomic damage compared to two Holocene sites. The higher fragmentation rates at Holocene sites are linked to longer exposure times of bioeroded shells before final burial. These differences suggest that shorter exposure times lead to lower fragmentation rates despite higher bioerosion levels. Mechanical tests confirmed that bioeroded shells are more fragile, breaking into angular fragments, thereby contributing significantly to shell damage. Thus, bioerosion coupled with moderate surface residence times, plays a crucial role in shell fragmentation, with hydrodynamic conditions being a secondary agent of shell damage in high-energy environments. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1007/s10347-025-00698-1
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 16
        StartPage: 1
    Subjects:
      – SubjectFull: Taphonomy
        Type: general
      – SubjectFull: Sedimentology
        Type: general
      – SubjectFull: Biogenic sedimentary rocks
        Type: general
      – SubjectFull: Energy dissipation
        Type: general
      – SubjectFull: Mollusks
        Type: general
      – SubjectFull: Fouling
        Type: general
      – SubjectFull: Holocene Epoch
        Type: general
      – SubjectFull: Brazil
        Type: general
      – SubjectFull: Rio de Janeiro (Brazil)
        Type: general
    Titles:
      – TitleFull: Damage triggered by bioerosion and surface residence time in Holocene shell beds from Brazil.
        Type: main
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            NameFull: Sedorko, Daniel
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            NameFull: Barros, João Paulo Porto
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            NameFull: Nebelsick, James H.
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            NameFull: de Barros, Gabriel Eduardo Barea
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            NameFull: Xavier, Juan Bueno
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            NameFull: Castro, João Wagner Alencar
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            – D: 01
              M: 05
              Text: May2025
              Type: published
              Y: 2025
          Identifiers:
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              Value: 01729179
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              Value: 71
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          Titles:
            – TitleFull: Facies
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